Wide-range dual-backlight display apparatus
First Claim
1. A wide intensity range dual illumination system for backlight displays comprising:
- a backlight display screen;
a daylight fluorescent lamp means for directly illuminating said display screen with high intensity daylight illumination;
first photosensor means proximate to said daylight fluorescent lamp means for providing an electrical signal representative of the intensity of said daylight illumination;
at least one nightlight lamp means positioned between said daylight fluorescent lamp means and said display screen for directing low intensity nightlight illumination onto said daylight fluorescent lamp means wherein said low intensity nightlight illumination is reflected from said daylight fluorescent lamp means and onto said display screen;
a second photosensor means proximate to said nightlight lamp means for providing an electrical signal representative of the intensity of said nightlight illumination;
and control means connected to said daylight fluorescent lamp means, said nightlight fluorescent lamp means, said first and second photosensor means and to a brightness command signal, wherein said control means provides signals to said daylight fluorescent lamp means and said nightlight lamp means for providing a smooth transition from said high intensity daylight illumination to said low intensity nightlight illumination for continuous dimming of said illumination on said display screen from maximum to minimum intensity.
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Accused Products
Abstract
A backlight display system having a display screen illuminated directly by high intensity daylight lamps and illuminated indirectly by lower intensity nightlight lamps positioned to reflect their light off the daylight lamps and onto the display screen. The backlight display system includes intensity gradient filters and/or distribution lenses to enhance the uniformity of reflected nightlight, a brightness enhancement filter/diffuser disposed before the display screen, and optical filtering positioned between the illumination sources and the display screen. Photosensor controlled intensity feedback is used to provide smooth continuous dimming transition from a wide range of maximum to minimum intensity. The system also provides a third monochromatic nightlight lamp array for "class A" Night Vision Imaging System (NVIS) compatibility and an override switch to assure that lighting restrictions needed for night-vision are maintained. The system thus provides illumination of the display screen for operating during daytime conditions, nighttime conditions, nighttime conditions of Class A NVIS device use, and nighttime conditions of Class B NVIS device use.
87 Citations
15 Claims
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1. A wide intensity range dual illumination system for backlight displays comprising:
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a backlight display screen; a daylight fluorescent lamp means for directly illuminating said display screen with high intensity daylight illumination; first photosensor means proximate to said daylight fluorescent lamp means for providing an electrical signal representative of the intensity of said daylight illumination; at least one nightlight lamp means positioned between said daylight fluorescent lamp means and said display screen for directing low intensity nightlight illumination onto said daylight fluorescent lamp means wherein said low intensity nightlight illumination is reflected from said daylight fluorescent lamp means and onto said display screen; a second photosensor means proximate to said nightlight lamp means for providing an electrical signal representative of the intensity of said nightlight illumination; and control means connected to said daylight fluorescent lamp means, said nightlight fluorescent lamp means, said first and second photosensor means and to a brightness command signal, wherein said control means provides signals to said daylight fluorescent lamp means and said nightlight lamp means for providing a smooth transition from said high intensity daylight illumination to said low intensity nightlight illumination for continuous dimming of said illumination on said display screen from maximum to minimum intensity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification